Added trait_exists() [TRAITS] [DOC]

- also changed class_exists() to return false for traits
- added related tests, and get_declared_traits() tests in ext/s/t/co

Implemented FR #39847 (mysqli_fetch_[field|fields|field_direct] need to return db)

Implemented FR #47802, support for character sets in DSN strings for PDO_MYSQL

Implement request #53659 (Implementing RegexIterator::getRegex() method). Patch
by Joshua Thijssen.

Silently casting an empty string, null or false into an object by adding a property
is pretty non-intuitive. If the same value was 1 or true you get a warning and it halts.

Since we can'

Silently casting an empty string, null or false into an object by adding a property
is pretty non-intuitive. If the same value was 1 or true you get a warning and it halts.

Since we can't break BC completely (yet) lets bump this from E_STRICT.

Also added a new section to UPGRADING for engine changes.

<?php
$x = '';
// $x = null;
// $x = false;
$x->baz = 1;
var_dump($x);

$y = 1;
$y->baz = 1;
var_dump($y);

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Implemented FR #48767 (SplFileInfo::getExtension())

- I had forgotten to commit UPGRADING (for enable_post_data_processing).

Implement FR #53457 (number_format must support more than one character for
thousands separator).

- Implemented bug/request #53427 - stream_select doesn't preserve the
keys. This cannot be backported to PHP 5.3 due to a BC break. See
UPGRADING for more information.

Implemented FR #53407 (make scandir()'s directory sorting optional).

Removed support for break/continue $var syntax

Added multibyte suppport by default. Previosly php had to be compiled with --enable-zend-multibyte. Now it can be enabled or disabled throug zend.multibyte directive in php.ini

- commit missing upgrading note (sqlite removed)

- Added section for build system changes in UPGRADING.INTERNALS

typo

- Added comment about binary SAPIs

Implemented FR #53264 (Add fputcsv method to SplFileObject).

- typo

REQUEST_TIME notes

Implemented FR #53238 (Make third parameter of preg_match_all optional).

- Added ReflectionParameter::canBePassedByValue().

- Added to UPGRADING(.INTERNALS) information about the changes on html.c.
- Added to UPGRADING information about the new class Transliteral, the new
parameter in dns_get_record and the fact

- Added to UPGRADING(.INTERNALS) information about the changes on html.c.
- Added to UPGRADING information about the new class Transliteral, the new
parameter in dns_get_record and the fact that call_user_func_array no longer
allows call-time pass-by-reference.

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Revert for now

* Added PHP_RAND_MAX and PHP_MT_RAND_MAX constants
* Deprecated getrandmax() and mt_getrandmax() in favour of the new constants

# We should promote constants for static data like such in

* Added PHP_RAND_MAX and PHP_MT_RAND_MAX constants
* Deprecated getrandmax() and mt_getrandmax() in favour of the new constants

# We should promote constants for static data like such instead of function calls
# maybe this was just an old left-over

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- Added missing entries related to pdo_dblib